Text message to folks who gab on their cellphones in bathrooms: It won’t wash.

That’s according to a new survey on cellphone etiquette, which found fewer people think it’s OK to yak on the phone in restrooms than did three years ago.

“More than 200 million people in the U.S. now have cellphones,” said Delly Tamer, CEO of LetsTalk.com, the online wireless retailer that commissioned the annual survey conducted in January.

“As that number has grown, we see that people are beginning to put up boundaries and evolve social norms about when and where they should use their cellphones,” Tamer said.

“Bathrooms, movies and theaters are out. Cars and supermarkets are in,” he said.

The nationwide online survey of 2,119 adults – 86 percent of who have cellphones – found that 38 percent believe it acceptable to use a cellphone in the bathroom. That’s down from 62 percent in 2003.

“It’s annoying,” said Will Batzle, 31, a networking engineer who recalled yesterday that he was in a public restroom at Penn Station recently and a guy on a cell “was cursing his wife out – things you shouldn’t be hearing in public.”

But Jennifer Tranel, who is visiting the Big Apple from Wisconsin, said, “I’d rather they use it in the bathroom than in the middle of a movie theater.”

The survey found 66 percent of those polled think it’s fine to use their cell in a supermarket, 63 percent give it a thumbs-up in cars, 45 percent on public transportation and a mere 2 percent at the movies or in a theater.

Earlier this week, the head of the National Association of Theater Owners said he’s considering asking Uncle Sam’s permission to jam cellphone reception during films.

“I don’t know what’s going on with consumers that they have to talk on phones in the middle of theaters,” John Fithian, president of the group, told the ShoWest conference in Las Vegas.

Both federal law and FCC rules ban the use of cellphone jammers.

With Post Wire Services

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On the wrong yak

Here are the results of LetsTalk.com’s new survey, which asked, “In which of the following places, if any, do you feel it is generally acceptable to speak on your cellphone?”